K4QXX — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EL87

Receiver-side FT8 activity involving K4QXX, decoded by SO8OO in southeastern Poland. 77 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-08-19.

These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.

SO8OO decoded 77 FT8 messages attributed to K4QXX as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (52%), followed by 40 m (25%) and 80 m (23%). Several six-hour UTC windows tied for the largest share (84%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

77
Messages attributed
10
UTC dates decoded
15
Active 15-min windows
-10 dB
Estimated median S/N

Bands

80m · 18 40m · 19 20m · 40
First attributed message: 2026-06-07
Last attributed message: 2026-08-19 22:55 UTC

Observed FT8 message patterns

Attributed sample
77 messages
Active dates
10 UTC dates
Estimated median S/N
-10 dB
Estimated 10th-90th percentile
-14 to +6 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 40, strong (≥ -8 dB) 32.

WSJT-X defines S/N reports against a 2,500 Hz reference noise bandwidth. The ranges above are SO8OO receiver-side display categories, not official WSJT-X classes, transmitter-power measurements or estimates of how easy the station is to hear elsewhere. Statistics include only successful decodes on SO8OO's monitored FT8 channels; transmissions that were not decoded are absent.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with K4QXX in decoded directed-looking exchanges:

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to K4QXX

The map compares the centres and boundaries of the locator field attributed to this token by decoded message structure, 2° × 1° as a Maidenhead square, and SO8OO's six-character receiver square. The separation is not an exact antenna-to-antenna distance or a radio-path length.

Attributed locator
EL87 · 40 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,675 km (approx.)
Last such locator decoded
2026-08-19 22:54 UTC

A decoded locator can describe portable, remote or special-event operation and is not proof of a permanent station address or transmitter identity.

Observed FT8 exchanges

S/N cells show: decoded at SO8OO / report transmitted by the counterpart. An observed exchange is not a QSL or an official logbook confirmation.

Time UTCBandK4QXX S/NCounterpartCounterpart S/NMsgsCapture
08-19 22:52 20m +8 / -4 ZA5G -11 / -10 9 ✓ Full exchange observed
08-19 20:59 20m - / - LZ4VR -18 / - 2 Partial capture
08-19 20:56 20m - / -13 YO4DWD -20 / - 3 Partial capture
08-19 20:56 20m -11 / - WB0TAX - / +1 2 ✓ Closing fragment
08-19 20:53 20m -5 / - TK4TH - / -1 5 ✓ Closing fragment
08-19 20:27 20m -11 / - OJ0YL - / - 3 Partial capture
08-16 02:13 80m - / - LZ2VQ -12 / - 3 Partial capture
08-08 23:36 40m - / -11 TA3JOH -22 / - 2 ✓ Closing fragment
08-08 23:33 40m - / -16 RN6MA -11 / - 3 Partial capture
08-08 23:21 20m - / -9 CT1BFP -17 / - 5 Partial capture
07-19 02:15 80m -13 / -6 SP6JIU +23 / -6 5 ✓ Full exchange observed
07-19 02:14 80m -16 / -13 UR5SG +13 / - 2 Partial capture
07-19 02:12 80m -17 / -12 TN8GD -23 / -10 5 ✓ Full exchange observed
07-19 02:08 80m - / -15 HB9EFK +4 / - 2 ✓ Closing fragment
07-13 01:57 40m -9 / - TJ1GD/P - / -16 2 ✓ Closing fragment
06-30 02:46 60m - / -13 DL7UFN -11 / - 3 ✓ Closing fragment
06-30 02:40 80m - / - SP9JMZ +5 / - 4 Partial capture
06-30 02:37 80m -13 / - PY5XT -24 / -3 3 ✓ Closing observed
06-30 02:36 80m - / - DL1STG -1 / - 3 Partial capture
06-30 02:36 80m -14 / -5 TM2WWA -2 / -18 4 ✓ Full exchange observed
06-30 02:35 80m - / - 9A4ZM +3 / - 4 Partial capture
06-30 02:34 80m -11 / - VE4KTZ - / -15 2 Partial capture
06-30 02:33 80m - / - OM1II +8 / - 16 Partial capture
06-30 02:32 80m - / - DK7UY -5 / - 2 Partial capture
06-29 00:10 40m - / -18 R2BIU -15 / - 3 Partial capture
06-29 00:08 40m - / -19 UA6LIK -15 / - 3 Partial capture

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

20m 
UTC    dB Audio  Message
205715 -22 1865  K4QXX YO4DWD -13
205730 -13  845  YT1UBN K4QXX RR73
205745 -22 1866  K4QXX YO4DWD -09
205830 -12  845  PD2V K4QXX RR73
205915 -15 1743  K4QXX LZ4VR KN13 (x2)
225215  +9  814  ZA5G K4QXX EL87 (x4)
225400 -12  765  K4QXX ZA5G -04
225415  +8  814  ZA5G K4QXX EL87
225430 -10  765  K4QXX ZA5G -04
225445 +11  814  ZA5G K4QXX R-10 (x2)
80m 
UTC    dB Audio  Message
021215 -24 1368  TN8GD K4QXX EL87
021230 -22  914  K4QXX TN8GD -12
021245 -13 1368  TN8GD K4QXX R-10
021300 -24  914  K4QXX TN8GD RR73
021315 -15 1368  TN8GD K4QXX 73
021445 -16 1368  UR5SG K4QXX EL87
021515 -12 1368  SP6JIU K4QXX EL87
021530 +13 1208  K4QXX UR5SG -13
021530 +23 2731  K4QXX SP6JIU -06
021545 -11 1368  SP6JIU K4QXX R-06
021600 +23 2731  K4QXX SP6JIU RR73
021615 -15 1368  SP6JIU K4QXX 73
021330 -14 1896  K4QXX LZ2VQ KN23 (x3)
40m 
UTC    dB Audio  Message
000845 -16 1361  K4QXX UA6LIK LN08 (x3)
001045 -14 1366  K4QXX R2BIU KO95 (x3)
015715  -8  741  TJ1GD/P K4QXX R-16 (x2)
015845  -9  742  KC1WZQ K4QXX RR73
010400 -18 2082  R6FX K4QXX RR73
233330 -10 2274  K4QXX RN6MA -16 (x3)
233630 -24 1875  K4QXX TA3JOH R-11 (x2)
60m 
UTC    dB Audio  Message
024645  -9 1247  K4QXX DL7UFN JO62 (x3)

Decoder S/N history by band

Count-weighted daily averages across messages attributed to this profiled token and successfully decoded at SO8OO, limited to the rolling 90-day UTC chart window.

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